Apparatus for dumping ash in chain grates



Aug. 19, 1924; 1,595,310

C. W. BURROUGHS APPARATUS FOR DUMPING ASH IN cHAIN GRATES Filed June 1, i922 INVE-NIOQ- CHARLES WESLEY BuQQouGHS.

ATTOQNE'Y.

Patented Aug. 19, 1924.

STATES PATENT omes.

APPARATUS FOR DUIVIPING ASH IN GHA I N GR ATES.

Application filed June 1, 1922. Serial 115,1 5,201.

l '0 all whom it may concern Be it known that 1, CHARLES lVEsLEY BURROUGI-IS, a subject of the'King of Great Britain and Ireland, residing at Montreal. Vest, Province of Quebec, Dominion of be of any type, has a bridge wall 2, built Canada, have invented new and useful Improvements in Apparatus for Dumping Ash in Chain Grates, of whichthe following is a specification.

This invention relates to chain grate stokers and more particularly to the ash dumping mechanism employed in connection with chain grates.

It has for its object to provide means for automatically and continuously dumping the ashes, without afiecting the heating power of the fire on the grate, and thereby maintaining a constant rate of steam production in the boiler.

A further object is to provide an ash dumping mechanism that will prevent the formation of clinkers.

A further object is to provide an ash dumping mechanism which will automatically adjust the rate of dumping to the rate of combustion of fuel on the grate.

A further object is to provide an ash dumping mechanism that is readily adaptable to any form of chain'grate.

A further object is to provide an ash dumping mechanism that reduces air leak age to a minimum.

A further object is to provide an ash dumping mechanism that is located beyond the area of radiant heat from the grate fire.

A further object is to provide an ash dumping mechanism that can have parts replaced with facility and during the operation of the stoker.

The invention consists briefly inproviding a series of narrow dumping plates pivotally supported on a bearing parallel and adjacent to the lower surface of the rear end of the chain grate. These bars or plates have legs, forming counterweights whereby they maintain a pressure against the chain grate in an upward direction, as will be fully set forth hereinafter.

Reference is made to the annexed drawings in which Figure 1 is a vertical cross section of the mechanism.

Figure 2 is a front elevation of a portion of the mechanism.

Figure 3 is a perspective view of the setting. with some of the dump plates removed, andcwithout showing the chain grate.

Figure 4 is a View showing a'dump plate tilted.

In Figure lthe chain grate 1, which may ashort distance from its rear end 11, sup ported on a plate 21, beneathwhich is a tube 4, mounted on bearings 22, in the side walls, or on the stoker frame, one end ex: tending beyond the wall, to which, a hand lever 42, is attached.

Pivotally supported on the tube 4, are a seriesof narrow dump plates 3, with-fin gers 31, of a1" shaped cross-section, as shown in Figure 4, counterweight legs 32, and teeth 33, which form the bearing surfaces 34, to fit loosely onthe tube 4.

, The tube 4, is/provided with a rib 41, along its lower side and'the lever 42, has an adjustable counterweight 43.

With a construction such as above set.

forth, the operation of the apparatus is as follows Q Owing to the weight of the legs 32, the

fingers 31, of the dump plates 3, press up-' Bymeans of the hand lever 42, the tube the fingers is slight, there is very little op- I -portunity for air to leak in, whereby a cooling effect would be produced.

4 andits rib 41 may be rotated and all the sure of the fingers 31, on the grate barsv may be increased or reduced. The grate bars will then depress the fingers they contact with against this pressure.

The position of the dump plates is such, that they are never exposed to the radiant heat of the furnace, being protected by the bridge wall 2, the ash resting on them, and the end of the grate 11.

I have found that ordinary grey iron castings will answer for the dump plates em ployed in this setting, in place of the usual expensive steel fittings required in other dumping mechanism, thereby greatly reducing the cost of a complete outfit.

Individual dump plates can be readily removed, by tilting them, as shown in Figure 4, and then. Sliding them' forward, and new plates can be inserted with ease and rapidity. This removal and replacement may be carried on during the operation of the furnace, with slight effect on the steadiness of its steam production.

The-ash which reaches the dump plates, being continuously removed therefrom, and not being exposed to the high temperatures of the furnace, is not subject to cl-inkeri'ng.

The rate of dumping being controlled by the rate at which the grate rotates, there will always be suitable dumping for the various speeds of firing.

Owing to the simplicity of its construction, and the ease of itsadj ustinent, this invention can readily be adapted to any type of chain grate stoker, and installed therein .at moderate expense.

IVhat I claim is 1. In a device of the class specified, the combination of a chain grate with a plurality of narrow dump plates pivotally supported on a bearing parallel with the end of the grate, having their front ends bearing upwardly on the lower part of the end of the grate.

2. In a deviceof the class specified, the

combination of a chain grate, with a plurality of narrow dump plates pivotally sup- 7 ported independently on a bearing parallel to the end of the grate, having counterweight legs adapted to cause their front ends to bear upwardly on the lower part of the end of the grate.

3. In a device of the class specified, the combination of a chain grate, with a bridge wall adjacent to the end of the grate, and a plurality of independent narrow dump plates, pi-votally supported beneath the bridge wall, and adapted to rock against the lower part of the end of the grate.

4. In a device of the class specified, the combination of a chain grate, with a bridge wall projecting towards the end of the grate, and a plurality of narrow dump plates pivotally supported beneath the bridge wall and in close proximity thereto, extending to and bearing upwardly on the lower part of the end of the grate.

5. In a chain grate ash dumping mechanism, the combination of a plurality of independent L shaped narrow dump plates having central bearing surfaces, formed by curved teeth, with a bearing tube journalled at each side, a rib thereon, and means to oscillate the said bearing tube.

6. In achain grate ash dumping mechanism, the combination of a plurality of independent L shaped narrow dump plates having central bearing surfaces formed by curved teeth, with a bearing tube journalled in the side walls, a rib thereon, an extension beyond one of the walls, a hand lever secured thereto, and an adjustable counterweight on the said hand lever.

CHARLES "WESLEY BURROUGHS. 

